Air diffuser



FIG. 1 is a front elevation view of an air diffuser, embodying our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is an opposite side elevation view thereof;

FIG. 5 is a front, top, and side perspective view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof. 

CLAIM The ornamental design for an air diffuser, as shown and described. 